Antiskid device.



E.y S. ROBERTS. 'Amnsmn' DEVICE. PpL-lc'ATloN mfp FEB. ya. 1914;

Patented Dec. 14, 1915;

Y improved device.

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EDIVIUND S. ROBERTS, OF YONKEBS, NEW YORK, ASSIGNOR, BY MESNE ASSIGNMENTS,

TO KELLY-SPRINGFIELD TIRE COMPANY, OF JERSEY CITY, NEW JERSEY, A COR- PORATION 0F NEW JERSEY.

ANTISKID DEVICE.

` Specification ofvLetters Patent.

patented lDec. 14, MM5.

Application led February 18, 1914. Serial No. f819,370.

To all whom it may concern Be it known that I, EDMUND S..R0BERTS, a subject oi" the Kingdom of Great Britain, residing at Yonkers, in the county of `West chester and State of New York, have invented certain new and useful Improvements in Antiskid Devices, of which the fol-y lowing is a specilication.

My invention relates to improvements in anti-skid devices for rubber tired wheels, especially adapted for block tires of the dual type.

The object of the invention is to provide an anti-skid device Jfor tires of the type referred to which will be simple in construction and effective in use and also one which may be readily installed on the wheel or removed.

In the accompanying drawings, Figurev 1 is a side elevation of a portion of a vehicle wheel equipped with block tires, showing my anti-skid device in'position thereon. Fig. 2 is a top plan view of the same. Fiff. 3 is a section on the line 3-3 of Fig. 1. Fig. 4 is a top plan View of the tread-plate of my Fig. 5 is a bottom plan view of the same. Fig. 6 is a side elevation of the same. Fig. 7 is a vertical section on the line 7-7 of Fig. 4.

Like parts are represented by similar' characters of reference throughout the several views.

In the drawings, 1 represents the telly of a vehicle wheel shown equipped with a series of spaced rubber blocks 2 arranged in dual form with the blocks of the respective rows staggered with respect toeach other, in the usual way; these blocks being secured on the wheel in any suitable and well-knownl way, such as by metal frames 3 which may be bolted to the channel and clamp the bases 2a of the rubber blocks.

The anti-skid device consists of a metallic plate 4 formed on the arc of a circle sub stantially equal to the circle formed by the outer treads of the rubber blocks. It is preferably formed of a length to extend over two of the rubber blocks, although it may be made longer than that if desirable and is of a V or wedge shape in form, as shown in Fig. 7. The outer periphery or tread of the plate is preferably provided with a series of transverse ribs 5 so as to.

present a roughened surface to the road. Extending laterally in each direction from the respective ends of the plate are lugs 6 and 7 and also extending laterally from the opposite 'side of said plate, intermediate the lugs 6 and 7, arel two lugs 8 and 9. rI he lugs 6 and 7 are located such a distance apart that, when the device is installed on the tire, they will project between the spaces 'between adjacent blocks 2 and inclose two o f said blocks. whereas the lugs or projections and 9 will project between the spaces between adjacent blocks on the opposite side ot' the wheel and inclose but one of said blocks. Chains 10, 11, 12 and 13 are attached to perforations in the respective lugs and extend under the wheel rim where they are secured together through the medium of an-eyebolt 14 on one of the chains of each pair, screw-threaded into the bent end of a link 15 of the other chain of the pair; these chains providing a iiexible connection so as to permit the tread-plate to vreld more or lless against the resilient rubber blocks; but at the saine time hold the plate securely in position.

In installing the device, the wedge-shaped portion is laid between the two series of' blocks, the construction being such that there will be a considerable space left between the bottom of the plate and the wheel channel or rim. the width of the tread portion of the plate, or that portion which comes in contact with the ground, being greater than the spa-ce between the respective rows ot' blocks.

In action, the plate acts as a wedge and when it together with the blocks on which it has a bearing. pass under the wheel, the tapering sides ot' the V portion permit the whole to go with the rubber so that the cx- 'tended portion which gives the traction al-v ways has the same relative extension beyond.l the periphery of the rubber. Alsmuowing to the Wedge shape, after the plate has passcdv under the wheel and the rubber assumes its normal position, the tapering `sides of the' piece maintain it in proper place. The lugs to which the chains are attached, by reason -ot being located in the spaces between the 'i en anti-skid device, the combination,` l e, tire ef' the dual type formed oit two series ef yieldable blocks and a wheel riin within which saidi blocks are secured, of a curved wedgeshaped plate located between 'the blocks et the respective tires, the tread 'eertioiA of said plate being wider than the eee' between said blocks and extended beend the treads ef saidblocks, and. iiexible evices extending between the ends of said i ,1nd beneath the rini et said wheel for plete in position.

il an enti-skid device, the combination`r Vith dual tire formed of two series of ects and a wheel rim within which said delas are secured, of a wedge-shaped plate between the blocks of the respective es., said plate having its sides formed on lines adapted to beeragainst the ges et the respective blocks, so that ai et seid plate will be extended ben 1"the treads of the respective blocks, and

devices extending between the reeetive blocks and beneath said wheel rim r securing said plate in position..

in an antiskid device, the combination, 'li

sible blecls end a wheel rim in which said two tires each formed of a series of4 blocks are secured, of a. curved plate located between the respective series of blocks, the enter peripheryv ot said plate being extended bevond the treads of said blocks. integrally iornied lugs on said plate proj ecting' between the ends or" adjacent blocks.l and flexible devices secured to said lugs and extended under the rini of said wheel for securungY said plate in position.

, 4. In an anti-skid device, the combination. with two tires each formed of a series of vieldable blocks and ay wheel rim in which f said blocks are secured, of a wedge-shaped plate located between the respective series of blocks, the sides of said plate being formed on straight lines adapted to bear upon the edges of the respective blocks so that the tread of said plate will be extended bevond the treads of said blocks the tread of said plate beingl wider than the space between the respective series of blocks. integrally formed lugs on said plate projecting in opposite directions between the ends et adjacent blocks` and flexible devices connected with said lugs and extended under the rin'i of said wheel for securing said plate in position.

In testimony whereof, I have hereunto set niv hand this eleventh day of February 1914-,

EDllUND S. ROBERTS.

lVtnesses: I

JOSEPHINF. G. ERNENwniN, NORMAN VALLACE. 

